US1286024A - Compounding rubber with powdery substances. - Google Patents

Description

TED STATES. arana curios.

'WILBUR CLARK KNOWLTON AND HARRY A. HOFFMAN, OF AKRON, OHIO, ASSIGNORS TO THE B. F. GOODRICH COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

GOMPOUNDING RUBBER WITH I'OWDERY SUBSTANCES.

Be it known tha-t iWe, W1LBUR CLARK KNowL'roN and HARRY A. HOFFMAN, citizens of the United States, residing at Akron,

in the county of Summit and State of Ohio,

-have invented certain new and useful Imexisting as an impalpable powder, our object being to keep the atmosphere in the vicinity of the mixing mill substantially free from the dust or powder, thus preventing waste and enhancin the comfort of the operatives. Instead of usmg the lampblack in its natural'condition, we prepare and treat the fine powder so as' to cause its concretion into friable grains or small lumps, dry and substantially free from dust, and in this form incorporate it with the rubber on the roller mill or in any suitable masticatin apparatus heated in the usual way to so ten the rubber, the friability of the lumps or grains permitting a uniform distribution of the filler throughout the rubber. We may use water or other volatile liquid alone as a concreting agent, first mixing enough of it with the lampblack to roduce the desired condition, and then drying the mass before mixing it with the rubber, or we may use a liquid binder composed of water and a small quantity of a soluble agglutinant such as glue, starch, dextrose or sugar, or w some binder insoluble or only partly soluble in water, but miscible therewith and having a tendency to hold the particles of the material together in the desired form, the binder remaining in the lampblack after evaporation of the water but not bein present in sufficient quantity injurious y to affect the qualities of the rubber compound.

By way of example, we may take by weight, 240 parts of lam black, 1000 parts of hot water and 5 parts 0 starch, the starch I Specification of Letters Patent.

Patented Nov. 26,1918.

1 Ap'iilication filed August '28, 1917. Serial No. 188,598. I;

being first dissolved in the water and the solution then thoroughly mixed with the lampblack, after which the resulting aste or syrup is dried iii shallow evaporating pans and the material is then ready for use. These proportions, however, may be varied within rather wide limit-s.

We do not claim broadly the granulation of the powder with a volatile liquid before mixing with the rubber, our invention being an improvement upon the process of that nature described in application of William C.

'Geer, Serial No. 100,153, filed May 26, 1916.

We claim:

1. The method of compounding a plastic substance with an impalpable powder which consists in causing a concretion of the powder into dry, granular 0r lumpy form, and then mixing it with the plastic substance.

2. The method of compounding rubber with a substance normally existing as an impalpable powder which consists in wetting the powder and drying it to produce a friable, granular Or lumpy condition, and incorporating the dry, granular substance with the rubber.

3. The methodof compounding rubber with lampblack which consists in wetting the powdered lampblack to concrete it, and drying the same, bringing it to a condition of friable grains or lumps, and incorporating the dry, granular lampblack with the ru her on a heated mixing mill.

4. The -method of' compounding rubber the lampblack with water, evaporating the water, leaving the lampblack in a granular Or lumpy condition, and then mixing it with the rubber.

5. The method of compounding a plastic substance with an impalpable powder which consists in mixing the powder with a concreting and binding liquid, drying the same,

producing a condition of friable grains or lumps, and mixing it with the plastic substance.

6. The method of compounding rubber with lampblack which consists in mixing the lampblack with water and a binder, evaporating the water, producing a condi- Q eeaoae tion of friable grains or lumps, and mixing ular lampblack with rubber on a heated said grains or lumps with the rubber. mixing mill.

7. The method of compounding rubber In testimony whereof we have hereunto 10 with 'lampblack which consists in mixing set our hands this 24th day of August, 1917. 5 the lampblack with water and a binder, producing a granular condition, evaporating WILBUR CLARK KNOWLTON. the water, and incorporating the dry, gran- HARRY A, HOFFMAN.